Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Structural phase transformation and optical absorption of capped TiO2 nanoparticles

Cui Yong-Feng Yuan Zhi-Hao

Structural phase transformation and optical absorption of capped TiO2 nanoparticles

Cui Yong-Feng, Yuan Zhi-Hao
PDF
Get Citation

(PLEASE TRANSLATE TO ENGLISH

BY GOOGLE TRANSLATE IF NEEDED.)

Metrics
  • Abstract views:  4220
  • PDF Downloads:  1924
  • Cited By: 0
Publishing process
  • Received Date:  24 November 2005
  • Accepted Date:  17 January 2006
  • Published Online:  20 October 2006

Structural phase transformation and optical absorption of capped TiO2 nanoparticles

  • 1. 天津理工大学纳米材料与技术研究中心,天津 300191

Abstract: TiO2 nanoparticles capped with a layer surfactant were prepared by colloid-chemical method, and their structural phase transformation and optical absorption properties were investigated. XRD and TEM results showed that the surfactant capping effectively inhibits the grain growth during heat-treatment, and results in a different crystallization behavior in which titania nanoparticles with amorphous structure can simultaneously transform into anatase and rutile when heat-treated below 400℃. It was found from optical absorption measurement that the capped TiO2 colloidal particles in toluene sol have a large red shift of absorption band edge in contrast with that without capping, which is mainly attributed to the effects of the interface dipole and dielectric confinement. In the investigation of the relation between the absorption coefficient and photon energy, it was found that there exist two linear correspondences of (αhν)1/2 vs hν(indirect transition) and (αhν)2 vs hν (direct transition) for the titania films and colloidal-particle organic sol. The respective band gap values were obtained by extrapolation of the above linear relation.

Catalog

    /

    返回文章
    返回